OPERATION METHOD FOR WASTE WATER TREATMENT PROCESS IN ZINC-LEAD REFINING METHOD

摘要

PPROBLEM TO BE SOLVED: To provide an operation method for a waste water treatment process where, in a zinc-lead refining method, when zinc and the other heavy metal ions in refining waste water are removed by a neutralization sedimentation process in the waste water treatment process therein, a zinc sulfate aqueous solution produced at a low cost by reducing the using amount of metal zinc is used as an inorganic flocculant. PSOLUTION: In a zinc-lead refining method, regarding the waste water treatment process therein, when zinc and the other heavy metal ions in refining waste water are removed by a neutralization sedimentation process, a zinc sulfate aqueous solution obtained in such a manner that a cementation final solution comprising zinc, cadmium and the other heavy metals produced in a cementation process where a cadmium sulfate aqueous solution comprising heavy metal ions as impurities is contacted with metal zinc, and cementation reaction is caused, so as to precipitate cadmium is contacted with metal zinc for 96 to 144 hr, thus a suspension composed of sponge-like metal and a zinc sulfate aqueous solution is formed, and the zinc sulfate aqueous solution obtained by separating the sponge-like metal from the suspension is used as an inorganic flocculant. PCOPYRIGHT: (C)2010,JPO&INPIT